Mu-metal
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thumb|Assortment of mu-metal shapes used in electronics, 1951 thumb|Five-layer mu-metal box. Each layer is about 5 mm thick. It reduces the effect of the Earth's magnetic field inside by a factor of 1500.
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- Properties
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thumb|Assortment of mu-metal shapes used in electronics, 1951 thumb|Five-layer mu-metal box. Each layer is about 5 mm thick. It reduces the effect of the Earth's magnetic field inside by a factor of 1500.
Mu-metal, or μ-metal, is a soft nickel–iron ferromagnetic alloy with very high permeability, which is used for shielding sensitive electronic equipment against static or low-frequency magnetic fields. The name came from the Greek letter mu (μ, (), which represents permeability in physics and engineering formulas.
Excerpted from Wikipedia’s “Mu-metal” article, available under the CC BY-SA 4.0 licence.